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asn1_read_value(3) libtasn1 asn1_read_value(3)
NAME
asn1_read_value - API function
SYNOPSIS
#include <libtasn1.h>
int asn1_read_value(asn1_node root, const char * name, void * ivalue, int * len);
ARGUMENTS
asn1_node root
pointer to a structure.
const char * name
the name of the element inside a structure that you want to read.
void * ivalue
vector that will contain the element's content, must be a pointer to memory
cells already allocated (may be NULL).
int * len number of bytes of *value: value[0]..value[len-1]. Initialy holds the sizeof
value.
DESCRIPTION
Returns the value of one element inside a structure. If an element is OPTIONAL and this
returns ASN1_ELEMENT_NOT_FOUND, it means that this element wasn't present in the der
encoding that created the structure. The first element of a SEQUENCE_OF or SET_OF is
named "?1". The second one "?2" and so on. If the root provided is a node to specific
sequence element, then the keyword "?CURRENT" is also acceptable and indicates the current
sequence element of this node.
Note that there can be valid values with length zero. In these case this function will
succeed and len will be zero.
INTEGER
VALUE will contain a two's complement form integer.
integer=-1 -> value[0]=0xFF , len=1. integer=1 -> value[0]=0x01 , len=1.
ENUMERATED
As INTEGER (but only with not negative numbers).
BOOLEAN
VALUE will be the null terminated string "TRUE" or "FALSE" and LEN=5 or LEN=6.
OBJECT IDENTIFIER: VALUE will be a null terminated string with each number separated by a
dot (i.e. "1.2.3.543.1").
LEN = strlen(VALUE)+1
UTCTIME
VALUE will be a null terminated string in one of these formats: "YYMMDDhhmmss+hh'mm'" or
"YYMMDDhhmmss-hh'mm'". LEN=strlen(VALUE)+1.
GENERALIZEDTIME
VALUE will be a null terminated string in the same format used to set the value.
OCTET STRING: VALUE will contain the octet string and LEN will be the number of octets.
GENERALSTRING
VALUE will contain the generalstring and LEN will be the number of octets.
BIT STRING: VALUE will contain the bit string organized by bytes and LEN will be the num-
ber of bits.
CHOICE
If NAME indicates a choice type, VALUE will specify the alternative selected.
ANY
If NAME indicates an any type, VALUE will indicate the DER encoding of the structure actu-
ally used.
RETURNS
ASN1_SUCCESS if value is returned, ASN1_ELEMENT_NOT_FOUND if name is not a valid element,
ASN1_VALUE_NOT_FOUND if there isn't any value for the element selected, and ASN1_MEM_ERROR
if The value vector isn't big enough to store the result, and in this case len will con-
tain the number of bytes needed.
COPYRIGHT
Copyright (C) 2006-2015 Free Software Foundation, Inc..
Copying and distribution of this file, with or without modification, are permitted in any
medium without royalty provided the copyright notice and this notice are preserved.
SEE ALSO
The full documentation for libtasn1 is maintained as a Texinfo manual. If the info and
libtasn1 programs are properly installed at your site, the command
info libtasn1
should give you access to the complete manual. As an alternative you may obtain the man-
ual from:
http://www.gnu.org/software/libtasn1/manual/
libtasn1 4.8 asn1_read_value(3)
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On Apache
Under GNU General Public License
2024-04-27 01:08 @18.191.240.243 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)